[jira] [Commented] (SPARK-41791) Create distinct metadata attributes for metadata that is constant or file and metadata that is generated during the scan

["Apache Spark (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-41791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17653143#comment-17653143 ] 

Apache Spark commented on SPARK-41791:
--------------------------------------

User 'olaky' has created a pull request for this issue:
https://github.com/apache/spark/pull/39314

> Create distinct metadata attributes for metadata that is constant or file and metadata that is generated during the scan
> ------------------------------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-41791
>                 URL: https://issues.apache.org/jira/browse/SPARK-41791
>             Project: Spark
>          Issue Type: Improvement
>          Components: Optimizer
>    Affects Versions: 3.3.1
>            Reporter: Jan-Ole Sasse
>            Priority: Major
>             Fix For: 3.4.0
>
>
> There are two types or Metadata in Spark
>  * Metadata that is constant per file (file_name, file_size, ...)
>  * Metadata that is not contant (currently only row_index)
> The two types are generated differently
>  * File constant metadata is appended to the output after scan
>  * non-constant metadata is generated during the scan
> The proposal here is to create different metadata attributes to distinguish those different types throughout the code



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